LocalizationExample impossible porting to Python

[ilincaburdulea]

Hello,

I am trying to use the Python version of GTSAM for FGO applied on GNSS data and the first toy example I was interested in implementing was exactly the one from gtsam/examples/LocalizationExample.cpp. I added the measurements as unary factors using the CustomFactor, all the other variables are exactly the same as in LocalizationExample.cpp, and the optimization result I got is this:

I couldn't get any better results and then discovered that actually LocalizationExample is impossible to port to Python according to gtsam/python/gtsam/examples/README.md. Can comebody give me more details why this is? Is using the pure C++ the only solution for implementing this use case?

Thank you!